System and memory module

Abstract

A system includes: a controller, a first memory module connected to the controller through a first data bus, and a second memory module connected to the controller through a second data bus, wherein the first memory module includes: first and second memory chips; a first data terminal connected to the first data bus, and a first switch unit that electrical connects the first data terminal with either the first memory chip and the second memory chip, and the second module includes: third and fourth memory chips; a second data terminal connected to the second data bus, and a second switch unit that switches over electrical connection of the second data terminal with either the third memory chip or the fourth memory chip.

What is claimed is: 
     
         1 . A system, comprising:
 a controller;   a first memory module connected to the controller through a first data bus; and   a second memory module connected to the controller through a second data bus that is electrically disconnected from the first data bus, wherein   the first memory module comprises:
 a first memory chip; 
 a first data terminal connected to the first data bus; and 
 a first switch unit that switches over electrical connection of the first data terminal with the first memory chip, and 
   the second memory module comprises:
 a second memory chip; 
 a second data terminal connected to the second data bus; and 
 a second switch unit that switches over electrical connection of the second data terminal with the second memory chip.